Fluoride including waste water processing device and method capable of processing fluoride including waste water to have low concentration of fluoride

A method of processing fluoride including waste water, comprising:

• a reaction processing step of adding calcium compound and coagulant in fluoride including waste water which is received in a reaction vessel while said fluoride including waste water is aggregated and of reacting said calcium compound with fluoride of said fluoride including waste water to generate calcium fluoride;
• a hold processing step of holding, in said reaction vessel, said at least part of said calcium fluoride which is generated in said reaction processing step;
• a sedimentation processing step of sedimenting said calcium fluoride in said fluoride including waste water in a sedimentation vessel that is sent from said reaction vessel, a bottom of said sedimentation vessel being associated with a bottom of said reaction vessel through an opening hole, said fluoride including waste water being sent to said sedimentation vessel from said reaction vessel through said opening hole;
• a sending back processing step of sending back said calcium fluoride to said reaction vessel from said sedimentation vessel, said sedimentation vessel having an inclined bottom surface, said calcium fluoride being sent back, by a self-weight of said calcium fluoride, to said reaction vessel from said sedimentation vessel along said inclined bottom surface;
• and
• a supernatant liquid draining step of draining supernatant liquid from said sedimentation vessel.

A method of processing fluoride including waste water, comprising:

• a reaction processing step of adding calcium compound and coagulant in fluoride including waste water which is received in a reaction vessel while said fluoride including waste water is aggregated and of reacting said calcium compound with fluoride of said fluoride including waste water to generate calcium fluoride;
• a hold processing step of holding, in said reaction vessel, said at least part of said calcium fluoride which is generated in said reaction processing step;
• and
• a fist sedimentation processing step of sedimenting said calcium fluoride in said fluoride including waste water in a sedimentation vessel that is sent from said reaction vessel, a bottom of said first sedimentation vessel being associated with a bottom of said reaction vessel through an opening hole, said fluoride including waste water being sent to said first sedimentation vessel from said reaction vessel through said opening hole;
• a coagulation processing step of adding said coagulant in said fluoride including waste water which is sent to a coagulation vessel from said first sedimentation vessel and which is aggregated to coagulate said calcium fluoride which is generated in said reaction processing step;
• a second sedimentation processing step of sedimenting said calcium fluoride in said fluoride including waste water which is sent to a second sedimentation vessel from said coagulation vessel;
• and
• a supernatant liquid draining step of draining supernatant liquid from said second sedimentation vessel.

A method of processing fluoride including waste water, comprising:

• a reaction processing step of adding calcium compound and coagulant in fluoride including waste water which is received in a reaction vessel while said fluoride including waste water is aggregated and of reacting said calcium compound with fluoride of said fluoride including waste water to generate calcium fluoride;
• a hold processing step of holding, in said reaction vessel, said at least part of said calcium fluoride which is generated in said reaction processing step;
• a first sedimentation processing step of sedimenting said calcium fluoride in said fluoride including waste water in a sedimentation vessel that is sent from said reaction vessel, a bottom of said first sedimentation vessel being associated with a bottom of said reaction vessel through an opening hole, said fluoride including waste water being sent to said first sedimentation vessel from said reaction vessel through said opening hole;
• a sending back processing step of sending back said calcium fluoride to said reaction vessel from said sedimentation vessel, said first sedimentation vessel having an inclined bottom surface, said calcium fluoride being sent back, by a self-weight of said calcium fluoride, to said reaction vessel from said first sedimentation vessel along said inclined bottom surface;
• a coagulation processing step of adding said coagulant in said fluoride including waste water which is sent to a coagulation vessel from said first sedimentation vessel and which is aggregated to coagulate said calcium fluoride which is generated in said reaction processing step;
• a second sedimentation processing step of sedimenting said calcium fluoride in said fluoride including waste water which is sent to a second sedimentation vessel from said coagulation vessel;
• and
• a supernatant liquid draining step of draining supernatant liquid of said fluoride including waste water from said second sedimentation vessel.

A fluoride including waste water processing device comprising:

• a reaction vessel for receiving fluoride including waste water;
• calcium compound adding means for adding calcium compound in fluoride including waste water which is received in said reaction vessel and for reacting said calcium compound with fluoride of said fluoride including waste water to generate calcium fluoride;
• a sedimentation vessel for receiving fluoride including waste water from said reaction vessel, said sedimentation vessel having a bottom which is associated with a bottom of said reaction vessel through an opening hole, said fluoride including waste water being sent to said sedimentation vessel from said reaction vessel through said opening hole, said sedimentation vessel having an inclined bottom surface, said calcium fluoride being sent back, by a self-weight of said calcium fluoride, to said reaction vessel from said sedimentation vessel along said inclined bottom surface;
• aggregating means for aggregating said fluoride including waste water in said reaction vessel;
• coagulant adding means for adding coagulant in said fluoride including waste water in said reaction vessel;
• and
• supernatant liquid draining means for draining supernatant liquid of said fluoride including waste water from said sedimentation vessel.

A fluoride including waste water processing device comprising:

• a reaction vessel for receiving fluoride including waste water;
• calcium compound adding means for adding calcium compound in fluoride including waste water which is received in said reaction vessel and for reacting said calcium compound with fluoride of said fluoride including waste water to generate calcium fluoride;
• a first sedimentation vessel for receiving fluoride including waste water from said reaction vessel, said sedimentation vessel having a bottom which is associated with a bottom of said reaction vessel through an opening hole, said fluoride including waste water being sent to said first sedimentation vessel from said reaction vessel through said opening hole, said first sedimentation vessel having an inclined bottom surface, said calcium fluoride being sent back, by a self-weight of said calcium fluoride, to said reaction vessel from said sedimentation vessel along said inclined bottom surface;
• first aggregating means for aggregating said fluoride including waste water in said reaction vessel;
• first coagulant adding means for adding coagulant in said fluoride including waste water in said reaction vessel;
• a coagulation vessel for receiving fluoride including waste water from said first sedimentation vessel;
• second aggregating means for aggregating said fluoride including waste water in said coagulation vessel;
• second coagulant adding means for adding coagulant in said fluoride including waste water in said coagulation vessel;
• a second sedimentation vessel for receiving fluoride including waste water from said coagulation vessel;
• and
• supernatant liquid draining means for draining supernatant liquid of said fluoride including waste water from said second sedimentation vessel.